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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Posted by John Luongo
John Luongo
5,735 Points

Should I redefine the value of description within the initializer?

Would this be a good value for 'description' = "red: (red), green:(green), blue: (blue), alpha: (alpha)"

trying to figure out how to create a new value, playing around with stuff like this in xcode: struct RGBColor { let red: Double let green: Double let blue: Double let alpha: Double

let description: String = "red: \(red), green:\(green), blue: \(blue), alpha: \(alpha)"

// Add your code below
init(red: Double, green: Double, blue: Double, alpha: Double) {
    self.red = red
    self.green = green
    self.blue = blue
    self.alpha = alpha
}
return description
structs.swift 
struct RGBColor {
    let red: Double
    let green: Double
    let blue: Double
    let alpha: Double

    let description: String

    // Add your code below
        init(red: Double, green: Double, blue: Double, alpha: Double) {
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
    }
    return description
}

1 Answer

jcorum
jcorum
71,830 Points

Almost. You need to create a value for description inside the initializer, rather than outside, and you are missing a space in your description String:

    init(red: Double, green: Double, blue: Double, alpha: Double) {
      self.red = red
      self.green = green
      self.blue = blue
      self.alpha = alpha

      //this must be inside, and there needs to be a space between green: and \(green)
      description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"
    }
John Luongo
John Luongo
5,735 Points

Thanks a million, the prompt through me off when it said "use the initializer to create a value for the first four properties."

I was thinking that your answer would have worked, just didn't try it b/c the wording of the challenge led me to think i 'only' needed to define RGBa values in the init. :\